Satellite bus developed by Lavochkin 2000-2010 for use by a variety of earth-resource and scientific satellites. Operational, first launch 2011.01.20. Dry mass 850 kg, propellant up to 540 kg, and payload up to 2600 kg. Solar panels provided 600-1100 watts maximum over a five-year designed operational life. Stabilized to within 2.5 deg by a hydrazine monopropellant system.